Three-way cock for steam-brakes



(No Model.)

T. J. SHE'LLHORN'. THREE-WAY GOGK FOR STEAM BRAKES.

No. 265,880. Patented Oct. 10, 1882.

I I. I

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on three-way cocks, which are especially defor Steam-Brakes; and I dohereby declare UNITED STATES PATENT OFFICE.

THOMAS J. SHELLHORN, OF HANCOCK, MICHIGAN.

THREE-WAY COCK FOR STEAM-BRAKES.

SPECIFICATION forming part of Letters Patent No. 265,880, dated October10,188.

Application filed February 2!, 1882. (No model.)

To all whom it may concern Be it known that I, THOMAS J. SHELLHORN, ofHancock, in the county of Houghton and State of Michigan, have inventedcertain new and useful Improvements in Three Way Cocks that thefollowing is a full, clear, and exact description thereof, referencebeing bad to the accompanying drawings, and to the letters of referencemarked thereon, which form part of this specification, in which- Figurel is a vertical section of my threeway cock. Fig. 2 is a verticalsection of the plug. Fig. 3 is a bottom view of the plug.

This invention relates to an improvement signed for usein connectionwith steam-brakes; and the nature of my invention consists in athree-way cock the plug of which is constructed'with an exhaust-portarranged on one of its sides and extended beneath its lower end, incombination with steam inlet and outlet passages formed in thecoupling-box of the plug, as will be hereinafter explained.

The following description of my invention, when taken in connection withthe annexed drawings, will enable others skilled in the art to fullyunderstand it.

A designates the coupling-box of the improved cock, which box isconstructed with steamways a a, coincident with each other. for thepassage of the live steam to acylinder. (Not shown in the drawings.)There is also-a passage, 1), at right angles to the passages or ways (aa and coincident with the vertical axis of the cock-plug B, throughwhich latter passage, 1), the exhaust-steam is allowed to escape fromsaid cylinder when the plug is properly adjusted for this purpose. Theplug B is the frustum of a cone, and it is seated in the box A, as shownin Fig. l,its lower end bearing on an annular shoulder, B, and forming,by the steam-pressure and the aid of a helical spring, g, a close jointon said shoulder or seat, B. The stem B of the cock-plug passes througha stufling-box formed of the parts 0, D, E, and E, and. its upper end isadapted to receive a lever or other means, by which it can be adjustedfor admitting steamto the cylin- .from the boiler.

der or allowing the escape of the exhauststeam therefrom. The plug B hasan oblong hole, Gr, diametrically through it, which hole is adjusted toregister with the ways a a when it is desired to admit steam to thecylinder On one side of the plug is a vertical groove, which extendsfrom a point near the upper end of this plug down to and beneath thelower end thereof, where the slot is expanded into a recess, which isconcentric to the vertical axis of the plug, as shown in Fig. 3. Thepassage thus made in the side and bottom of the plug B forms anexhaust-port, F, which is caused to register with the steamway a andoutlet-passage b by adjusting the plug one-quarter of a turn about itsaxis from the position indicated in Fig. 1, and this port F will allowthe steam from the cylinder, above referred to, to escape throughpassages a I) when the communication between the boiler and'saidcylinder is cut off.

\Vhen my improved cool; is used on or in connection with a steam-brakethe engineer can apply or release the brake by simply adjusting the plugBone-quarter of a turn either one way or theother.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination of the coupling-box A, the plug B, having thevertical and horizontal exhaust-port F, the steam-port G, and the seatB, formed in the said coupling-box, substantially in the manner and forthe purpose described.

2. The combination of the coupling-box having three ways, a plug, B, aspring to hold it down,the vertical and horizontal exhaust-passages inthis plug, the seat B in said coupling-box, and the passage G,substantially as described.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

THOMAS J. SHELLHORN.

Witnesses:

DAVID S. KENDALL, GHAs. H. SANFORD.

